Columbite Tantalite Piece

Mar 31, 2006 a piece of columbitetantalite, size 6x 2x 2cm coltan short for columbitetantalite and known industrially as tantalite is a dull black metallic ore hat onlineolumbite for sale bullet moldarge coltan 69arge coltan columbite tantalite niobium tantalum ore odd uranium chemistry nm.

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